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Old 04-13-2014, 07:38 PM   #1
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1975 25' Tradewind
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Replacing my belly pan and drilled through my black water tank

What's the best way to repair a small drill hole in the bottom of my black water holding tank??
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Old 04-13-2014, 08:17 PM   #2
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I would consider putting a glob of epoxy on a screw and simply screwing it in.
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Old 04-13-2014, 09:42 PM   #3
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Your tank is likely made of roto-molded poly-ethylene. It is pretty hard to find glues/epoxies/caulks that will stick to it. If you can find something, then definitely try gooping it up. There was a recent thread where a guy had a leaking fresh water tank in a 2000's vintage trailer. It looked like a spun on fitting had separated from the tank. He said that he repaired it with with some kind of marine epoxy. Maybe worth a try if you can find the thread.

Otherwise, you might be able to repair it with plastic welding, or a spun-on blank fitting (plug).
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Old 04-13-2014, 10:02 PM   #4
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Another take on this might be to use a tap, tap threads into the tank, coat a proper sized screw or bolt with epoxy and screw it in.

It it leaks you are out a few bucks and a few minutes, if it works, you are out of the woods for a few bucks and a few minutes.

Is the repair fails, the attempted fix won't screw up anything.

I have a feeling that this fix will work and work well.
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Old 04-13-2014, 10:52 PM   #5
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You might try using JB Weld epoxy. It comes on two small tubes.
Another great epoxy is Marine Tex. Marine Tex tends to flow a little before it goes off. You might try mixing a small amount, forming it into a dowel shape, inserting half of it onto the hole, spreading the outside part, then use a hit dryer to slightly hear the area. It may spread the material inside before it starts to harden.

Or, you could use either of these products to heavily coat a screw to plug the hole. That might be the surest method. I would use some 80 grit sand paper to roughen up the area around tho hole to give the epoxy a "tooth" to secure to. Forgive me for using a preposition to end a sentence with.

Good luck.
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Old 04-13-2014, 11:15 PM   #6
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Look for a product called LEXELL in your local lumber store.
Tapping the hole is a good idea. Use a Stainless Steel screw. Apply the LEXELL to the treads. Screw it in.
I swear this stuff will stick to water.
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Old 04-13-2014, 11:31 PM   #7
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Thanks for the suggestions

I'll let ya know if the screw and epoxy / sealent works!
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Old 04-14-2014, 08:50 AM   #8
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Done that way more than i care to rember, you need a O-ringed seal screw.
Call APM HEXSEAL at 201-569 5700 Tell them about it, ask for a free sample.
I think a (OVERSIZE PAN HEAD STAINLESS 10-32 UNF should do it )
WW GRANGER sells them 100 pc box just in case, best of luck-Jim
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Old 04-14-2014, 12:16 PM   #9
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I like the O-ring sealed screw approach. You can put some RTV over the screw head for added protection.

Perry
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Old 04-14-2014, 02:03 PM   #10
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An O ring or flat rubber washer on a sheet metal screw. I am assuming a small hole but you could probably do this up to a 1/4 inch or more
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Old 04-14-2014, 02:53 PM   #11
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By the way, you can get short double ended sheet metal drill bits at mcmaster.com. You can chuck them up in the drill so that only about 1/2" protrudes. This makes it a lot less likely that you will drill through the tank. Usually there is about 1" of foam under the tank.

Perry
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Old 04-14-2014, 03:02 PM   #12
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Drill the hole bigger, get a rubber well nut, tighten with a stainless bolt. I suspect epoxy will not stick! If you must try glue, I suggest gorilla glue. It will expand on both sides effectively making a seamless 2 sided cork. You don't want this to fail with the pan in place with your wife and kids away from home. Deal breaker!
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Old 04-14-2014, 03:06 PM   #13
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3M 5200, made for marine use. It is rated for use below the waterline on boats. Should stick to anything.
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Old 04-14-2014, 09:26 PM   #14
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